Stool



FIG. 1 is a perspective view of a stool in accordance with the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is another perspective view thereof; and,

FIG. 8 is another perspective view thereof.

The broken lines in the drawings illustrate portions of the stool which form no part of the claimed design. 

CLAIM The ornamental design for a stool, as shown and described. 